Liquid-cooled internal combustion engine

Abstract

A liquid-cooled internal combustion engine having a piston-controlled exhaust, particularly a two-stroke cycle internal combustion engine, is provided with a generator or a magneto-generator unit and with a lubricating oil pump. The cylinder head is provided with a cap, which defines a space for cooling liquid and extends over the cylinder approximately as far as to the exhaust port and at its end that is adjacent to the crankshaft has a sealing surface. In order to minimize the transmission of solid-borne sound and the radiation of sound, the cap and the cover for the oil pump are secured by means of collar screws, which have been tightened against a stop, and a washer provided with a vulcanization-bonded rubber layer is disposed between the head of each of said screws and the cap or the cover.

I claim: 
     
       1. A liquid-cooled internal combustion engine comprising (a) a cylinder having an axis extending between opposite ends of the cylinder,   (b) a cylinder head closing one of the cylinder ends, the cylinder being in communication with an exhaust passage axially spaced from the cylinder head,   (c) a crankshaft extending transversely to the cylinder axis and spaced from the end of the cylinder opposite the one cylinder end,   (d) a metallic housing means wherein the crankshaft is rotatably mounted,   (e) a metallic cap mounted over the cylinder head and cylinder, (1) the metallic cap, the cylinder head and the cylinder defining a chamber for a cooling liquid, and   (2) the metallic cap having a sealing surface remote from the cylinder head and facing the metallic housing means,     (f) a piston slidably mounted in the cylinder and operatively connected to the crankshaft, the piston being operable to open and close communication between the cylinder and the exhaust passage,   (g) electric power generating means operatively connected to the crankshaft,   (h) a lubricating oil pump operatively connected to the crankshaft and operable to discharge lubricating oil,   (i) a first metallic cover arranged over the lubricating oil pump and a second metallic cover arranged over the electric power generating means, the first and second metallic covers having sealing surfaces facing the housing means, (1) the metallic cap and the first and second metallic covers being secured to the metallic housing means at the sealing surfaces, and     (j) soft, non-metallic seals interposed between the sealing surfaces and the metallic housing means, the seals preventing metal-to-metal contact between the sealing surfaces and the housing means.   
     
     
       2. The liquid-cooled internal combustion engine of claim 1, wherein the housing means is a crankcase. 
     
     
       3. The liquid-cooled internal combustion engine of claim 2, further comprising carrier arms projecting from the crankcase, a metallic carrier rigidly secured to the carrier arms, the lubricating oil pump being movably mounted on the metallic carrier in an opening of the first metallic cover, a closure detachably mounted on the first metallic cover for closing the opening, the first metallic cover having a further sealing surface facing the metallic carrier, a non-metallic soft seal interposed between the further sealing surface and the metallic carrier for preventing metal-to-metal contact between the further sealing surface and the metallic carrier, and gear means operatively connecting the lubricating oil pump to the crankshaft. 
     
     
       4. The liquid-cooled internal combustion engine of claim 1, wherein the metallic housing means has a surface facing the sealing surface of the metallic cap, tapped bores extending into the metallic housing means from the surface thereof, and further comprising metallic collar screws each having a collar part, a screw part and a head part for securing the metallic cap to the metallic housing means, the head part engaging the metallic cap, the collar part extending from the head part through the metallic cap and engaging the metallic housing means surface around a respective one of the tapped bores, and the screw part extending into the respective tapped bore, and a washer including a vulcanization-bonded rubber layer, the washer surrounding the collar part and being interposed between the head part and the cap. 
     
     
       5. The liquid-cooled internal combustion engine of claim 1, wherein the housing means comprises a cylindrical part accommodating the electric power generating means, the second metallic cover terminates in a tubular skirt extending into the cylindrical housing means part, and further comprising O-ring means fitted between the cylindrical housing means part and the tubular skirt, the O-ring means securing the cylindrical housing means part and the tubular skirt to each other.